Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 7_0_4 like Mac OS X) AppleWebKit/537.51.1 (KHTML, like Gecko) Version/7.0 Mobile/11B554a Safari/9537.53)

Zyxlsy: check your statement to be sure. Carbon slips in particular - you may have circled HKD but the terminal will simply ignore it (figuring you or your bank couldn't be bothered to chargeback).

Thermal slips with no mention of USD are definitely DCC-free and need not be checked.